You my have misunderstood me. Its not about n-gon, also a n-gon limit could be useful as above 20 vertex they tend to slow down openGL,
The thing is about having multiple vertex in a mesh with identical position, or almost. So maybe its 2 um different, but thats all far from being visible. The thing I do on exported mesh is run a merge vertex at distance 0.0 um and usually get like 1-5% hits. Reducing not only vertex, but also getting rid of wrong drawed polygons.
Maybe I have to send sample ...
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